9/22/2011: The color identity of your commander is set before the game begins and doesn’t change during the game, even your commander is in a hidden zone (like the hand or library) or an effect changes your commander’s color.

9/22/2011: If your commander is a card like Kozilek, Butcher of Truth that has no colors in its color identity, Command Tower’s ability produces no mana.

9/22/2011: In formats other than Commander, Command Tower’s ability produces no mana.

The information presented on this site about
Magic: The Gathering, both literal and graphical,
is copyrighted by Wizards of the Coast.
This website is not produced, endorsed, supported,
or affiliated with Wizards of the Coast.